跨/超临界下真实燃料喷射模型的构建及模拟  

Construction and Simulation of Real Fuel Injection Model Under Trans-/Supercritical Conditions

作　　者：马杰 刘宏升[1] 解茂昭[1] 李亮 MA Jie;LIU Hongsheng;XIE Maozhao;LI Liang(Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education,Dalian University of Technology,Dalian 116024,China;Weichai Power Co.,Ltd.,Weifang 261000,China)

机构地区：[1]大连理工大学海洋能源利用与节能教育部重点实验室,大连116024 [2]潍柴动力股份有限公司,潍坊261041

出　　处：《工程热物理学报》2022年第11期3103-3109,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51576029)。

摘　　要：本研究以开源软件OpenFOAM为平台,基于真实流体状态方程与高压修正的热动力学输运模型,通过修改PIMPLE算法,构建出一个新的多组分跨/超临界射流模型,并通过一维对流问题考察了模型有效性;在此基础上,结合RANS模型对跨/超临界下正庚烷/氮气的喷射和混合过程进行了数值模拟。结果表明:在跨临界工况下,尤其在伪沸点附近,射流对温度的变化非常敏感,伪沸腾现象维持着气液界面出现连续的高密度梯度区,其对跨临界射流的演变起着决定性作用;在超临界工况下,伪沸腾现象的消失导致射流与周围流体的混合更加充分。This study is based on the OpenFOAM,using real-fluid equation of state and highpressure modified thermodynamic transport models,and adjusting the PIMPLE algorithm to construct a new multi-component trans-/supercritical jet model,meanwhile,the one-dimensional convection problem is used to validate the model;based on this,the RANS simulation of the nheptane/nitrogen injection and mixing process was performed under trans-/supercritical conditions.The results show that:under transcritical conditions,especially near the pseudo-boiling point,the jet is very sensitive to the changes in temperature,the pseudo-boiling phenomenon causes a continuous high-density gradient zone at the interface,which is decisive in the evolution of the transcritical jets;the lack of pseudo-boiling under supercritical conditions makes the jet mixing more fully.

关 键 词：跨/超临界工况 伪沸腾 真实流体状态方程 热动力学模型 

分 类 号：TK123[动力工程及工程热物理—工程热物理]